Abstract

It is demonstrated that ultrahigh sensitivity of glucose refractive index measurement can be achieved via surface plasmon resonance excitation in which the phase difference between - and -polarized reflected waves is monitored as a function of the incident angle. Sensitivity with values down to the order of is obtained by performing the measurements at optimal incident wavelengths. This represents an order of magnitude improvement compared to the previously reported values in the literature.

Received 23 September 2005Accepted 08 March 2006Published online 04 April 2006

Acknowledgments:

The authors are grateful for financial support from Center of Nanostorage Research, National Taiwan University, under Grant No. MOEA#94-EC-17-A-08-S1-0006, National Science Council of Taiwan ROC under Grant Nos. NSC 94-2112-M-019-007 and NSC 94-2120-M-019-001 and National Taiwan Ocean University under Grant No. NTOU-AF94-05-04-01-02.